I must be the last of the lot because I still use lip seals and haven't had a problem.:shocking:
IF your rotors don't/are not warped you will not have a problem, much less we can NOT GRIND the rotors.....because I have never spotted a rotor grinder that can finish it like a sanded surface after grinding like a phonograph record...I know, I had my rotors cut in the rear, years ago, and so I noticed this clicking sound when going slo in a parking lot/garage which allowed the sound to bounce back at me, jacked it up, and ran it without wheels, rotors still secured by my wheel adapters....and noted that just at idle in 1st gear, the pads were pulsing in/out against the later securing PIN, and had worn it a good bit....
and nearly had the pads worn down to the liner where the pin was....I looked at that action and nearly shit bricks....bought new rotors, had to clock them to min then shim them with tin foil to take care of the lateral runout, but got it done, been fine for years now.....
The crap I have had to fight on this car, straight outta the factory designs, has been amazing....but such is advances in designs, may as well take advantage of them when repairing shit, especially if it's cheeeeeeep and easily done....
Some years ago, I had to do the front rotors, due to a collapsed left front brake hose, that bitch was SMOKING in the ~45 mile trip home fighting every inch of the way....at LO speed, obviously...
so new front rotors from NAPA, 30 bux each, talk about cheep, I figgered CHINA, but no, came in an American box, even the cardboard, the guy said they owned the factory....interesting comment, and so on the car, the lateral runout was PERFECT, rebuilt the offending caliper, changed all the hoses, and was shocked the caliper was not stone fried/destroyed/melted but I put in new pistons/rings/seals anyway on that one.....
:shocking::beer: